Which accelerators focus on medical devices?

U Penn has a medical device accelerator

https://healthcareinnovation.upenn.edu/MDA

In addition: Medical Startups (a non profit) lists several healthcare startup accelerators here

https://www.medicalstartups.org/top/accelerator/

For companies working on digital health solutions, Digital.health lists a number of them

https://www.digital.health/digital-health-accelerators

New accelerators pop up all the time. Make sure you do a quick web search with the keywords "healthcare startup accelerator" to see what's out there.